Base station for distance determination

• US 6,748,008 B2
• Filed: 02/12/2002
• Issued: 06/08/2004
• Est. Priority Date: 03/22/1999
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K.
• Primary Examiner(s): PHU, PHUONG M
• Application Number:
  US10/074,398
• Publication Number:
  US 20020136266A1
• Time in Patent Office: 847 Days
• Field of Search: 375/130, 375/140-144, 375/148-150, 455/456, 455/457, 455/423, 455/424, 455/522, 455/562, 342/127, 342/457, 342/145
• US Class Current: 375/145
• CPC Class Codes: G01S 5/0218 Multipath in signal reception
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A base station transmits a first spread spectrum signal having a first code. It receives and analyzes an impulse response of multipath components of a second spread spectrum signal having a second code to determine a first received component. The second signal is time synchronized with the first spread spectrum signal. A distance determination is made based on in part a timing difference between the second code of the received second signal and the first code of the base station'"'"'s transmitted first signal and the determined first received components for that base station'"'"'s received second signal.

Claims

1. A base station comprising:

means for transmitting a first spread spectrum signal having a first code;

means for receiving and analyzing an impulse response of multipath components of a second spread spectrum signal having a second code to determine a first received component of the second spread spectrum signal, the second spread spectrum signal time synchronized with the first spread spectrum signal; and

means for making a distance determination based on in part a timing difference between the second code of the received second spread spectrum signal and the first code of the base station'"'"'s transmitted first spread spectrum signal and the determined first received component for that base station'"'"'s received second spread spectrum signal.

2. The base station of claim 1 wherein the first spread spectrum signal is a pilot signal.

3. The base station of claim 1 wherein the distance determination is determined by dividing the timing difference by two times a speed of light.

5. The base station of claim 1 wherein the first spread spectrum signal is a pilot signal.

6. The base station of claim 1 wherein two of the antennas are

seperated by a distance 1, the carrier phase difference is φ

, a wave length of the carrier is λ and

a value m is per $m=\frac{\mathrm{\phi <br><br>}·<br><br>\mathrm{\lambda <br><br>}}{2<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{\pi <br><br>}}$

and the determined angle α

is per

4. A base station comprising:

a plurality of antennas, each of the antennas separated by a known distance;

means for transmitting a first spread spectrum signal having a first code;

means for receiving, using the plurality of antennas, and analyzing an impulse response of multipath components of a second spread spectrum signal having a second code to determine a first received component of the second spread spectrum signal, the second spread spectrum signal time synchronized with the first spread spectrum signal;

means for making a distance determination based on in part a timing difference between the second code of the received second spread spectrum signal and the first code of the base station'"'"'s transmitted first spread spectrum signal and the determined first received component for that base station'"'"'s received second spread spectrum signal;

means for comparing a phase difference of a carrier signal of the second spread spectrum signal as received by each of the plurality of antennas; and

means for determining an angle of the received second spread spectrum signal using the distance determination and the phase difference.